Final answer:
Shorelines change due to various factors, with rise or drop in sea level and uplift or subsidence of the coast being significant contributors. Global warming, which causes melting of glaciers, can lead to sea level changes that impact shorelines and local ecosystems.The correct options are C (rise or drop in sea level) and D (uplift or subsidence of the coast).
Step-by-step explanation:
The question concerns the dynamic nature of shorelines and the factors that contribute to their ongoing changes. Based on the information provided and the understanding of shoreline systems, the following options can cause change in shorelines:
- C. rise or drop in sea level
- D. uplift (rising up) or subsidence (dropping down) of the coast
These changes can be due to various factors, including global warming that leads to the melting of glaciers and consequently a rise in sea levels. This process can inundate shorelines, reducing the size of islands and potentially destroying local ecosystems.